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If you are stuck in the field with nothing else... a recovery machine will give you some pull but you will have to play with the system to make this method work.

The blue recovery system was probably a Promax. These, even well used, will give you at least 1000 microns on a 3 ton system with a 50’ line set. Pull down then push with nitrogen and pull down again. Watch your micron gauge for leaks. You know the drill.

There are other companies out there that don’t pull at all... so if your vacuum pump goes bad and you need to finish that job today.... use your recovery machine in a pinch. Doesn’t make you a hack just a good improviser.

If you have recovery machine capable of pulling 1000 microns of vacuum, you will have more than enough vacuum for moisture removal. Water boils at approx. 6 degrees f. at 1000 microns, so I am sure if you can pull to 1000 it would be enough to do the job. Check out the chart on robinairs sitehttp://www.robinair.com/new/acsoluti...acuum.php#eff1